Charles o



(No Model.)

' G. 0. HBGGEM.

BALANCED SLIDE VALVE.

No. 489,867. Patented Jan. 10, 1893.

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llivirno STATES PATENT CHARLES O. HEGGEM, OF MASSILLON, OHIO, ASSIGNORTO THE RUSSELL &

COMPANY, OF SAME PLACE.

BALANCED SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 489,867, dated January10, 1893.

Application filed August 8, 1892.

To 60% whom it may concern.-

Be it known that I, CHARLES 0.1-IEGGEM, a citizen of the United States,and a resident of Massillon, county of Stark, State of Ohio, haveinvented a new and useful Improvement in Balanced Slide-Valves, of whichthe following is a full, clear, and exact description, referones beinghadto the accompanying drawings, making part of this specification.

My invention relates to an improvement in balanced slide valve, theobject of which is to provide a simple economical and durable structureresulting in the construction of a slide valve which may be held atequilibrium or as nearly so as is practical, the percentage of downwardpressure of which may be pre viously determined.

With these ends in view my invention relates to certain features ofconstruction and 2c combination of parts as will be hereinafter described and pointed out in the claims.

Figure 1 of the accompanying drawings is a view in perspective, showingvalve chamber cut away disclosing the upper portion of the valve, thepacking ring, and a portion of the inclosing cylindrical cap. Fig. 2 aplain view, with a portion of the cylindrical cap removed, to show thetop or upper portion of the packing ring and spring. Fig. 3 is alongitudinal section showing the parts in position.

Similar letters of reference indicate corresponding parts in all of thefigures of the drawings.

3 5 A, represents the engine cylinder and B,

the valve seat, having steam ports a and exhaust ports I) c the steamport by which steam is admitted into the slide valve 0, in the face ofwhich are provided admission ports d, cand f through which steam isadmitted from the inside of the valve 0, and the steam port 0. The portseserve to reduce the stroke or movement of the valve, and the eccentricby which motion is given thereto.

In operation the valve moved to the right six eighths of an inch,willbring ports (1 and 0 over port a leading to the engine cylinder and portf over steam port 0 through which steam'will fiow from the inside of thevalve O, and steam port 0 to the cylinder, the same seal 110,441,999.(N0 model.)

' movement of the valve will uncover or open the port a, in the righthand end of the cylinder to allow the steam in that end of the cylinderto escape through the port ct under the valve and out through theexhaust b.

D, represents the valve chamber, and E the lid or cap, in which isprovided a cylindrical socket h,having placed therein a ring F, having aperipheral groove j, in which packing rings 7:; are placed, or ifpreferred a few small grooves adapting the ring for water packing, willserve to form a steam joint between the walls of the recess or socket h,and the periphery of the ring. The ring F serves as a continuation ofthe valve O,which slides thereunder, and is provided with arms L asshown; central to the ring is secured the spring m having turned up endsthat rest against the under side of 'the cap E, and serve to hold thering down on the back n of the valve. The size of the recess isdetermined by the combined areas of the ports d, e, f. If the area ofthe recess 71. is equal to the combined area of the ports (I, e, f, thevalve will be held in equilibrium, plus the energy of the spring m whichis provided with just sufticient energy to hold the ring to the back ofthe valve. But to secure the seating of the valve, the area of therecess It should be from fifteen to twenty five per cent. less than thecombined area of the ports d, cf.

In operation steam will pass from the inside of the valve throughaperture 0 against the under side of the cap E within the recess h andthe upper side of the ring by which it is held down on the back of thevalve, the up lifting force of the steam being limited to the combinedarea of the ports d, e f is overcome by the difference in the area ofthe ports d e f and the area of the recess h. The ring F being held inequilibrium by the up pressure of the steam under the back n of thevalve. Apertures as p in the side of the valve conmeet the valve chamberand the exhaust ports I) through which Whatever steam may have reachedthe chamber, may pass out, thus relieving the valve from outside steampressure in the chamber. The top surface of the back 71 of the valve issurfaced, as the face, and the ring F, ground and adapted thereto, toform we a steam joint between the back of the valve and the ring, thevalve to slide under the ring. The advantage gained by this structure inaddition to that of balancing the valve is that the face of the valve isnot held hard against the valve seat, the ring F being adapted for aslight vertical adjustment for the relief of the valve.

Having thus fully described the nature and object of my invention, WhatI claim and desire to secure by Letters Patent is:

1. The combination with a steam cylinder having ports a, b, c, b, of theslide valve 0, having ports cl, e and f, valve chamber D, cap E having acylindrical recess h and a ring F adapted to move vertically therein,and to rest on the back of the valve, and aperture 0 in said back,circumscribed by said ring, sub- In testimony whereof I have hereuntoset 0 my hand this 12th day of July, A. D. 1892. CHARLES 'o. HEGGEM.

"Witnesses:

W. K. MILLER, CHAS. R. MILLER.

Correction in Letters Patent No. 489,867!

It is hereby certified that the assignee, The Russell 85 Company, inLetters Patent No. 489,867, granted J anuary 10, 1893, upon theapplication of Gherles 0. Heg gein, of Massillon, Ohio, for animproirement in Belzinced Slide Valves, should have been described andspecified as Russell (It 00., instead of The Russell 85 Company; andthat the said Letters Patent should be read With this correction thereinthat the same may conform to the record of the ease in the PatentOffice.

Signed, countersigned, and sealed this 6th day of March, 1894. s

JNO. M. REYNOLDS}, Assistant Secretary of the Interior,

[SEAL] Oountersigned JOHN S. SEYMOUR,

Oomnissioner of Patents.

